*EllenVannin" I'm an asthma sufferer who used to live in Suffolk and my asthma worsened during the 20 years I lived there. You would think that living in a rural area would be good, but no. In a nearby village there was a pollution measuring station and I read a report that placed it in the top 10 of polluted areas. One reason was the industrial pollution coming over from the Ruhr valley. Another was oil seed rape, the pollen of which, combined with heavy rain was disastrous for asthmatics.
My DH read an article about a wine tasting held on a boat on the Australian coast. Apparently the tasters were talking about the smoky flavour (obviously not caused by this year's fires) and they were bringing out their Ventolin inhalers and didn't know what was causing the problem because they couldn't see the smoke.
A couple of year ago, in London, I was so incapacitated by the atmosphere that I had to go everywhere by taxi. It wasn't the diesel fumes wot did it, it was caused by all the building works - on the underground but also renovating blocks of flats and adding extra storeys.
Where i live in France the air quality is very good - witnessed by the growth of lichen which only likes clean air. But, if I go into a supermarket, often the air quality is poor. Most people won't notice but us poor asthmatics do.